Lophoctenium comosum Richter, 1851

Description.-Intergenic epirelief. Large rooster tails more than 100 mm across with round outside gallery usually not seen. Spreite concentric, curved, 5 to 6 mm wide, and asymmetric ridge with gentle slope on outside face. Small, angular, obliquotransverse ridges of sand alternate with furrows of shale on the outside face of the spreite ridge. Ridges are 2 to 3 mm
wide, diverge from main ridge at approximately 45? with their long face to outside.